The conformable Meandering Winding Magnetometer (MWM®) eddy current sensors and MWM-arrays provide new inspection capabilities for gas turbine components. The sensors provide measurements of coating thickness and absolute electrical conductivity, which can capture features of interest for a population of components, e.g., for tracking fleetwide trends in quality and aging, failure evaluations, and correlating failure origins to features of specific fleet population segments. Inspection applications include metallic and nonmetallic coating thickness and porosity measurement, detection of cracks on complex surfaces, imaging and detection of small flaws, thermal degradation monitoring, and cold work quality assessment. For example, the U.S. Air Force uses the MWM for cold work quality control on all of the C-130 propeller blades that go through the Warner Robins ALC. For P-3 and C-130 propeller blades, trend analysis is being performed fleetwide. This paper describes MWM technology advances for absolute property measurements and specific capability demonstrations. Multifrequency quantitative inversion methods used for coating characterization are also used for characterization of process-affected zones, such as shot peen quality or titanium alpha case characterization.
Conformable Eddy-Current Sensors and Arrays for Fleetwide Gas Turbine Component Quality Assessment
Contributed by the International Gas Turbine Institute (IGTI) of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Paper presented at the International Gas Turbine and Aeroengine Congress and Exhibition, New Orleans, LA, June 4–7, 2001; Paper 01-GT-212. Manuscript received by IGTI, Dec. 2000; final revision, Mar. 2001. Associate Editor: R. Natole.
Goldfine , N., Schlicker , D., Sheiretov , Y., Washabaugh , A., Zilberstein , V., and Lovett, T. (September 24, 2002). "Conformable Eddy-Current Sensors and Arrays for Fleetwide Gas Turbine Component Quality Assessment ." ASME. J. Eng. Gas Turbines Power. October 2002; 124(4): 904–909. https://doi.org/10.1115/1.1477196
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